code: def init(self, state):
      self.t = 0
      pyro.sample("x_mean", dist.Normal(0.0, 2.0))
      pyro.sample(
          "y_mean",
          dist.MultivariateNormal(
              torch.zeros(self.state_size),
              2.0 * torch.eye(self.state_size),
          ),
      )
  
imports: import pytest
  import torch
  import pyro
  import pyro.distributions
  import pyro.poutine
  from pyro.infer import SMCFilter
  from pyro.infer.smcfilter import _systematic_sample
  from tests.common import assert_close
label_desc: Use image node_id 2 for calling the SmokeGuide obj's underlying member method code with example usage: obj.init(state) without return types